Glyceria obtusa, commonly known as obtuse mannagrass, is a perennial grass native to freshwater tidal marshes, wet meadows, and the edges of ponds and streams across eastern North America. It typically grows up to 3 feet tall and forms dense clumps of bright green, lance-shaped leaves. The inflorescences are loose panicles that appear in late spring to early summer, with flowers that are not particularly showy but are ecologically significant for wetland habitats.

Obtuse mannagrass is valued for its ability to stabilize soil and filter water, making it an excellent choice for wetland restoration projects and erosion control in riparian zones. It is also a beneficial food source for waterfowl and other wildlife. In cultivation, it requires consistently wet or muddy soils and can tolerate a range of light conditions from full sun to partial shade. While it is not typically used in ornamental landscaping, it serves an important function in naturalized plantings and wildlife gardens. Care should be taken as it can spread vigorously in ideal conditions, potentially becoming invasive in areas outside its native range.CC BY-SA 4.0